这一类信号词是属于最为简单的信号词，比如“Okay”, “Well”, “Now”, “But”, and “So”这些，具体来说：
But all the other elements, like the location or characters, might be modified for each audience. Okay. So what about fairy tales?
Take the Grand Canyon for instance. Now, we geologists thought we had a pretty good idea of how the Grand Canyon in the southwestern United States was formed.
Um… and it was basically because of Uranium-Lead Dating. Why? Well, as everyone in this class should know, we usually look at the grain type within sandstone, meaning the actual particles in the sandstone, to determine where it came from. “But” and "So" are usually followed by a key point.
Let’s move on to ...
This brings me to my next point, which is….
So far we have have been looking at…. Now I’d like to….
So now that we've covered…
What … is all about is this…
All right folks, let’s continue our discussion of alternative energy sources and move on to what’s probably the most well-known alternative energy source--- solar energy.
What Aristotle’s ethical theory is all about is this: he’s trying to show you how to be happy—what true happiness is.
All right, so far we have been looking at some of the core areas of linguistics, like syntax, phonology, semantics. Now I’d like to talk about the branch of historical linguistics, and the comparison of several different languages, or the comparison of different stages of a single language.
(观点opinion) I think, It appears that, It is thought that
(理论theory) In theory, the hypothesis is that
Now, in theory, that would seem a great time to advertise, but maybe a research shows you’re wrong, that the customers who buy sports equipment tend not to give it as a holiday gift, but want to use it themselves.
Well, the current hypothesis is that these microorganisms produce a chemical that interacts with the oxygen in the air, creating conditions that lead to the formation of the low thick clouds we observed.
原因类：reasons (because, since)
结果类：results (as a result, so, therefore, thus, consequently)
举例类：examples (for example, such as)
比较类：comparisons (in contrast, than)
对比类：an opposing idea (on the other hand, however)
引申类：another idea (furthermore, moreover, besides)
并列类：a similar idea (similarly, likewise)
解释类：restatements of information (in other words, that is)
结论类：conclusions (in conclusion, in summary)